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（1）计算：2cos45°+|﹣1|﹣+（﹣2019）0 （2）化简：（2+a）（2﹣a）+a（a﹣1）
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×﹣12017﹣﹣1+|1﹣2cos45°|
计算﹣22﹣+2cos45°+|1﹣|
计算﹣2+|1﹣|﹣2﹣π0+2cos45°.
2cos45°﹣﹣﹣1﹣﹣π﹣0.
计算－12012－＋2cos45º＋|－|.
计算－－1－|－3|－3－π0＋2cos45°.
计算2cos45°﹣tan40°+10++sin30°﹣1.
计算﹣20150+|1﹣|﹣2cos45°++﹣﹣2.
计算|－4|－－10+2cos45°+
计算|﹣3|+2cos45°﹣．
计算2cos45°﹣π+10++﹣1.
计算2cos45°﹣﹣﹣1﹣﹣π﹣0.
6tan230°-sin60°-2cos45°=__________________.
计算1﹣0+|﹣|﹣2cos45°+﹣1.
计算|﹣2|﹣3﹣π0+2cos45°=.
计算||+π﹣30+﹣1﹣2cos45°.
20170×－－1－|－3|＋2cos45°.
计算1﹣0+|﹣|﹣2cos45°+﹣1
计算2cos45°﹣π+10+﹣2﹣1．
计算﹣2cos45°﹣﹣1﹣π﹣10
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化学是一门以实验为基础的科学下列实验操作无误的是
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有机合成的出现是材料史上的一次重大突破．从此人类摆脱了依赖天然材料的历史．下列选项中不属于合成材料的是
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WhilewaitingtopickupafriendattheairportIhadoneofthoselife﹣changingexperiences﹣thekindthatsneaksuponyou1. Inoticedamanwithtwobagsstoppedrightnexttometo2hisfamily.Firsthemotionedtohisyoungersonmaybesixyearsoldgivinghimalonglovinghug.Asthey3enoughtolookineachother'sfacethefathersaidSogoodtoseeyouson.Imissedyoumuch!SmilingthesonrepliedsoftlyMetooDad.ThenthemanstoodupgazedintheeyesofhisoldersonmaybenineortenYou'realreadyquitetheyoungman.Iloveyouverymuch.Theytoohuggedamostlovingtenderhug. Meanwhileababygirlperhapsoneyearoldwasexcitedinhermother'sarmsnevertakinghereyes4thewonderfulsightofher5father.ThemansaidHibabygirl!andgentlytookthechildfromhermother.Hekissedherfaceandheldherclosetohischestwhile6herfromsidetoside.AftermomentshehandedhertohisoldersonanddeclaredI've7thebestforlast!andproceededtogivehiswifethelongestandmostpassionatekiss. Thentheystaredateachother'seyes8.Foraninstantthey9meofnewlyweds新婚butIknew10theageoftheirkidsthattheycouldnotpossiblybe.Ipuzzledaboutitforamomentandthenrealizedhowtotally11Iwasinthewonderfullydisplayofunconditionallove.Isuddenlyfelt12asifIwasinvadingsomething13butwasamazedtohearmyownvoicenervouslyaskedWow!Howlonghaveyoubeenmarried? Beentogetherfourteenyearstotalmarriedtwelveofthose.herepliedstaringather. Thenhowlonghaveyoubeenaway?Iasked.ThemanfinallyturnedtomesayingTwowholedays. Iwas14.BytheirgreetingIhadassumedhe'dbeengonefor15afewweeks﹣ifnotmonths.Iknowmyexpression16me.Toeasethe17IsaidIhopemymarriageisstillthatpassionateaftertwelveyears.Hesuddenlystoppedsmilinglookedmestraightintheeyeandsaidsomethingthat18meanotherperson. Don'thopefriend…decide!thenheflashedmewithhiswonderfulsmileagain. Iwasstillwatchingthatexceptionalmanandhisfamilywalkoutof19whenmyfriendcameuptomeandaskedWhatareyoulookingat? Withouthesitatingandwithacurioussenseof20IrepliedMyfuture! 1A.attackingly B.unfortunately C.unexpectedly D.immediately 2A.greet B.Pickup C.accept D.send 3A.loved B.separated C.left D.walked 4A.off B.from C.Outof D.away 5A.interesting B.laughing C.returning D.kissing 6A.rocking B.shaking C.moving D.walking 7A.had B.left C.saved D.bought 8A.sobbing B.laughing C.smiling D.crying 9A.made B.told C.informed D.reminded 10A.of B.by C.about D.to 11A.absorbed B.involved C.strange D.silly 12A.unkind B.friendly C.responsible D.uncomfortable 13A.sacred B.mysterious C.strange D.classified 14A.apologetic B.stunned C.defeated D.sorry 15A.atmost B.shortly C.atleast D.atbest 16A.betrayed B.shocked C.turned D.laughedat 17A.excuse B.fact C.fault D.embarrassment 18A.found B.left C.kept D.showed 19A.room B.town C.love D.sight 20A.sadness B.certainty C.happiness D.disappointment
在HOCNaClCa六种元素中选择元素组成物质用化学式填空 1用于金属表面除锈的酸 2改良酸性土壤的碱 3作干燥剂的氧化物 4相对分子质量最小的氧化物．
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下列变化过程发生了化学变化的是
MadeinChinaishavingitsmomentnow﹣andit'safashionableone. ThestoryofChinesefashionbeganin2011whenFeiyueandHuilibothChinesesportsshoebrands品牌suddenlygotinternationalattention.Theirproductswereseenallovertheworld.ChinesesportswearbrandLiNingwasattheNewYorkFashionWeekinSeptember2018.Theyshowedtheirnewdesigns﹣sweatersandjacketswithChinesecharacters. ShaunReinmanagingdirectorofChinaMarketResearchGroupsaidthatthelatestChinesebrandsnolongercatchcustomers'eyebylowprice.HetoldCNNTheyaresurethattheycangoheadtoheadwithforeignbrands. MaybeitisbecauseChina'syoungpeoplearenowmoreconfidentabouttheirownculture.Theydon'tshowimmediateinterestinwesterncultureanymore. Today'syoungpeopleinChinaarecrazyaboutChineseculturalelements元素.JinQuthemanagerofaclothingshoppingwebsitesaidataculturalfestivalin2018.TheyliketheseelementsprintedontheirclotheseventhebrandpictureofLaoganmainChinawhichwasonceseenasoutsideoffashion.ButnowyoungpeopleareproudoftheseChinesesymbols. InfactmanystarsintheWestarenowinterestedinChineseculturalelementsinfashion.RihannaaUSsingerforexampleworeaChinesereddresstothe2015MetGalainNewYork.ThedresswasdesignedandmadebyChinesedesignerGuoPei. WehavetomovefrommakingtocreatingChinese﹣AmericandesignerAricChenoncetoldTheNewYorkTimes.Wewanttoreplacethewords‘MadeinChina'with‘DesignedinChina'. 1ThenewdesignsofLiNingCompanyinSeptember2018were. A.coatsandscarvesinChinesered B.sweatersandjacketswithEnglishwords C.coatsandscarveswithAmericansymbols D.sweatersandjacketswithChinesecharacters 2TheunderlinedwordTheyinParagraph5refersto. A.Today'syoungpeopleinChina B.TheworkersinJinQu'sshop C.SomefamousstarsintheWest D.DirectorsofsomeChinesecompanies 3Whatcanbethebesttitleforthepassage? A.ChineseClothesBrands B.SportsinChina C.ChineseCulturalFestival D.DesignedinChina 4Thepassageabovemaybetakenfroman. A.newspaper B.guidebook C.novel D.ad
某小组同学在实验室进行中和反应实验往氢氧化钠溶液中滴入酚酞溶液观察到溶液变红色再逐滴加入稀盐酸并不停搅拌直至溶液恰好变成无色．盐酸与氢氧化钠反应的化学方程式为实验中用胶头滴管滴加盐酸并不停搅拌的目的是． 1实验中观察到滴入一定量稀盐酸后溶液中有少量气泡产生产生这一现象的原因是． 2为测定该样品中碳酸钠的质量分数某小组同学设计如图所示实验其中试样中滴加有酚酞溶液． 实验中需持续缓慢通入空气其目的是使试样与滴入的稀盐酸充分反应实验中取氢氧化钠溶液的质量为100g试样溶液恰好变成无色时滴入稀盐酸的质量为75g稀盐酸的溶质质量分数为14.6%实验后测知D中溶液的质量增加了2.2g则试样中碳酸钠的质量分数为如果没有C装置则测定结果将选填“偏大”“不受影响”或“偏小”．
随着环境问题的日益严重垃圾的处理问题正日益被人们所重视．某垃圾处理厂对金属垃圾主要成分是铁铜氧化铁二氧化硅处理及综合利用的部分工艺如图所示．请回答下列问题 1III均为操作此操作中玻璃棒的作用是搅拌 2步骤③所发生的反应属于基本反应类型中的 3请写出步骤②④所发生反应的化学方程式 ②④．
某同学在校运动会上不慎受伤用30%的双氧水给伤口消毒他惊奇的发现涂抹双氧水时有气泡产生于是他和兴趣小组的同学们开展了以下探究活动． 1血液中含有过氧化氢酶请用化学方程式说明甲同学涂抹双氧水时产生气泡的原因如何用实验验证产生的气体． 2查阅资料FeCl3也可加快双氧水分解兴趣小组的同学们对影响双氧水分解快慢的因素进行了以下探究 通过上述操作兴趣小组的同学们想探究的是因素对双氧水分解快慢的影响．为确保实验结果准确上述操作还应控制哪些因素①②．
海水中有着丰富的化学资源人们可以从海水中提取出很多的物质如氯化钠镁等．如图就是利用海水提取氯化钠的大致过程 1图中①是填“蒸发池”或“冷却池”． 2析出晶体后的母液是氯化钠的填“饱和溶液”或“不饱和溶液”． 3实验室除去粗盐中难溶性杂质的主要实验步骤有Ⅰ溶解Ⅱ填操作名称Ⅲ蒸发 上述三个步骤中用到的同一种玻璃仪器的名称是．
归纳推理是学习化学的重要方法之一下列推理正确的是
abc三种物质的溶解度曲线如图所示请根据图象回答问题 1二氧化碳在水中的溶解度随温度的变化趋势和以上物质相似用abc填空． 2t2温度下等质量的ab两饱和溶液溶剂的质量ab填“＞”“＜”或“＝”． 3M点对应的c溶液降低温度溶质的质量分数填“增加”“减少”或“不变”． 4t1温度下向200g水中加入60g物质b求所得溶液中溶质的质量分数结果保留0.1%．
WhenIaskedmymother﹣in﹣lawtoselectwhichmealsshe'dlikemetoorderfromthehome﹣deliverymenusheonlychosetheonesherhusbandwouldlike.Thisgoeswaybeyondpoliteness.Sheisactuallyfeelinguncomfortablevoicingwhatshewants.ShedevelopedthemainsymptomofAsker'sSyndromethatone'sunabletoaskforwhatonewants. It'snotjustolderwomenwhohavethisproblem.Asker'sSyndromecanstriketheyoung.Ihavesinglefriendswhowon'taskamanoutonadatebecausetheyfearbeingconsideredtooforward.Myfive﹣year﹣olddaughterVioletisshowingtheearlystagesofAsker'sSyndrome.She'slearnedthatwomendon'taskbutratherdrophints.She'llsayRememberlastSundayafternoonwewenttothepark?ratherthanCanwegotothepark? Apartfromwomenandgirls'problematicrelationshipwithappetitefoodanddatingit'swidelyreportedthatwomenarelesslikelythanmentoaskforpayrisesandpromotions.Insteadtheywithdrawhopingthatsomebodyelsewilldecidetheyareworthyandmakethempromoted. NodoubtmanywomendevelopAsker'sSyndromeasadefensivemeasurebecausethey'vebeenlabeledaspushyorrudeforsimplyaskingforwhattheywant.Butinthelongtermchoosingnottoexpressourdesiresdoesn'tserveuswell. It'stimetocureourselvesandourgirlsofAsker'sSyndrome.Idon'twanttoraiseafuture‘burntchopmother'whodeniesherwishforfoodpowerandsuccessandanythingelse.Iinsistthatsheaskforwhatshewantsdirectly. Forwomeninourcultureaskingisaskillthatweneedtolearnandpractice.Andifwealldoitthenwomenaskingwillbecomethenormratherthantheexception. 1Theauthor'smother﹣in﹣lawismentionedinParagraph1to. A.introducetheoldlady B.setanexample C.talkaboutherillness D.leadinatopic 2WhichisTRUEaboutAsker'sSyndromeaccordingtothepassage? A.Itoftencausesproblemswithappetiteandfood. B.Olderwomendevelopmoreofitssymptoms. C.Morewomensufferfromitthanmenintheircareer. D.Womendenyaskingforwhattheywantbecausetheyaretoopolite. 3Thepassageiswrittento. A.listsymptomsofAsker'sSyndrome B.encouragewomentoexpresstheirdesires C.explainthecausesofrefusingtoask D.suggestwaystoaskformore
金属制品在曰常生活中应用广泛下列有关金属的性质描述正确的是
Itwas3:45inthemorningwhenthevotewasfinallytaken.Aftersixmonthsofarguingandfinal16hoursofhotparliamentarydebatesAustraliansNorthernTerritorybecamethefirstlegalauthorityintheworldtoallowdoctorstotakethelivesofincurablyillpatientswhowishtodie.Themeasurepassedbytheconvincingvoteof15to10.AlmostimmediatelywordflashedontheInternetandwaspickeduphalfaworldawaybyJohnHofsessexecutivedirectoroftheRighttoDieSocietyofCanada.Hesentitonviathegroup'son﹣lineserviceDeathNET.SaysHofsess:Wepostedbulletinsalldaylongbecauseofcoursethisisn'tjustsomethingthathappenedinAustralia.It'sworldhistory. Thefullimportmaytakeawhiletosinkin.TheNTRightsoftheTerminallyIlllawhasleftphysiciansandcitizensaliketryingtodealwithitsmoralandpracticalimplications.Somehavebreathedsighsofreliefothersincludingchurchesright﹣to﹣lifegroupsandtheAustralianMedicalAssociationbitterlyattackedthebillandthehasteofitspassage.Butthetideisunlikelytoturnback.InAustralia﹣whereanagingpopulationlife﹣extendingtechnologyandchangingcommunityattitudeshaveallplayedtheirpart﹣otherstatesaregoingtoconsidermakingasimilarlawtodealwitheuthanasia.IntheUSandCanadawheretheright﹣to﹣diemovementisgatheringstrengthobserversarewaitingforthedominoestostartfalling. UnderthenewNorthernTerritorylawanadultpatientcanrequestdeath﹣probablybyadeadlyinjectionorpill﹣toputanendtosuffering.Thepatientmustbediagnosedasterminallyillbytwodoctors.Afteracoolingoffperiodofsevendaysthepatientcansignacertificateofrequest.After48hoursthewishfordeathcanbemet.ForLloydNicksona54﹣year﹣oldDarwinresidentsufferingfromlungcancertheNTRightsofTerminallyIlllawmeanshecangetonwithlivingwithoutthehauntingfearofhissuffering:aterrifyingdeathfromhisbreathingcondition.I'mnotafraidofdyingfromaspiritualpointofviewbutwhatIwasafraidofwashowI'dgobecauseI'vewatchedpeopledieinthehospitalfightingforoxygenandclawingattheirmaskshesays. 1Fromthesecondparagraphwelearnthat. A.theobjectiontoeuthanasiaisslowtocomeinothercountries. B.physiciansandcitizenssharethesameviewoneuthanasia. C.changingtechnologyischieflyresponsibleforthehastypassageofthelaw. D.ittakestimetorealizethesignificanceofthelaw'spassage. 2Whentheauthorsaysthatobserversarewaitingforthedominoestostartfallinghemeans. A.observersaretakingawait﹣and﹣seeattitudetowardsthefutureofeuthanasia B.similarbillsarelikelytobepassedintheUSCanadaandothercountries C.observersarewaitingtoseetheresultofthegameofdominoes D.theeffect﹣takingprocessofthepassedbillmayfinallycometoastop 3WhenLloydNicksondieshewill. A.facehisdeathwithcalmcharacteristicofeuthanasia B.experiencethesufferingofalungcancerpatient C.haveanintensefearofterriblesuffering D.undergoacoolingoffperiodofsevendays 4Theauthor'sattitudetowardseuthanasiaseemstobethatof. A.opposition B.suspicion C.approval D.indifference
假设你是LiMing以下是你的南非笔友Seb发给你的一封电子邮件请根据该邮件内容给Seb回一封邮件. 要求:1.考生需按电子邮件格式完成整封邮件; 2.邮件中不能出现真实姓名校名等相关信息; 3.词数:90～100 ﹣﹣﹣﹣ ﹣﹣﹣﹣ ﹣﹣﹣﹣
某微粒的结构示意图为下列对该微粒化学式表达正确的是
下列关于溶液的说法错误的是
假如英语课上老师要求同桌之间交换修改作文请你修改你同桌的以下作文.文中共有10处错误涉及单词的增加删除或修改. 增加:在缺词处加一个漏词符号∧并在此符号下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错词下面划一横线并在该词下面写出修改后的词. 注意:1每处错误及其修改均仅限一词; 2只允许修改10处多者从第11处起不计分. Thepersonwhohastaughtmethemostaboutlifeismygrandmother.Shewasmorethanjustagrandmothertome.WhenshediedafewyearsbeforeIfeltIlostareallygoodfriend.Shealwayslookedveryniceonherage.Shedideverythingshecouldmakemefeelathome.Shewasimaginativeandwouldspendhourstellmestoriesshehasmadeup.IamsureitwasbecauseofherwhichIbecameastorywriter.Apartfromkeepingayoungboyentertainingshetaughtmealargenumberofimportantthingsonwhattobehave.IwasratherimpatientwhenIwasachildandshetaughtmethatgoodthingshappenedifIcouldwaitforthem.Shewasapositivepersonbutshealsotaughtmehowtolookforthegoodineverything.
苯酚C6H5OH是一种应用广泛的化工原料下列关于苯酚的说法不正确的是
古诗词是古人留给我们的宝贵的精神财富请按要求回答下列诗句中涉及到的化学知识 1赠别中写到“蜡烛有心还惜别替人垂泪到天明”涉及到的化学变化是． 2梅中写到“遥知不是雪唯有暗香来”请从微观角度解释该现象的原因． 3墨梅中赞赏文人画中的梅“不要人夸颜色好只留清气满乾坤”涉及了碳单质的请填字母序号． A．稳定性B．吸附性C．导电性D．还原性 4元日中“爆竹声中一岁除春风送暖入屠苏”诗句中涉及到的化学反应S+2KNO3+3CK2S+3CO2↑+X则X的化学式是．
ManypeoplegotoUtahbecausetheylovehikinginBryceCanyonNationalPark.Theyenjoy1岩石climbingcampingandsoon.HoweversomepeoplegotoUtahforavery2不同的experience. TheBoulderOutdoorSurvival生存SchoolBOSSinUtahistheworld'soldestsurvivalschool.Itteachespeoplehowtostayalivewithouttentsorevenbackpacks.InBryceCanyonthedaysarevery3热的andthenightsareverycold.Noteveryonewantstogoandexperiencelifewithoutmodern4发明likesmartphonesande﹣books.StudentsatBOSSquicklylearnthatitisimportanttoworkhardand5尝试newthingsiftheywanttocompletethetraining. InsurvivalcampsatBossstudentsdon'justpractisecampinghikingor6骑horses.Theygointothewildfordaysorweeks.Theylearnhowtofind7新鲜的waterfordrinking.Theyalsolearnhowtomakeafireusea8小刀andfindfoodtoeat.Naturecanoftengivethem9每件事theyneedtosurvive. Afterthesepeoplegobacktotherealworldtheymayneverusetheseskillsagain.Eveniftheydon'tat10至少theywillalwaysknowthattheycanlivewithoutcomputerselectricityandsmartphones﹣evenifitisonlyforafewdays!
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